"I can't imagine you as anything other than a mother first and foremost," she wrote. "We of course all had our doubts, especially when you thought you would be breast feeding for the first five years of your son's life LOL, but from the moment Mason was born, you were just a complete natural.

"I have loved every minute of watching your transformation from crazy Kourt to loving mommy, and Mason is so lucky to have you," she went on. "I feel truly blessed that I got to witness this beautiful transition in your life."